diff --git a/Cargo.lock b/Cargo.lock
index c9b3092b9..820fe1fb7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -9250,6 +9250,7 @@ dependencies = [
  "rand 0.8.5",
  "reqwest",
  "serde",
+ "serde_bytes",
  "serde_derive",
  "serde_json",
  "serial_test 0.5.1 (git+https://github.com/tworec/serial_test.git?branch=actix_rt_test)",
diff --git a/exe-unit/components/gsb-http-proxy/Cargo.toml b/exe-unit/components/gsb-http-proxy/Cargo.toml
index 26fc57db4..812d35ead 100644
--- a/exe-unit/components/gsb-http-proxy/Cargo.toml
+++ b/exe-unit/components/gsb-http-proxy/Cargo.toml
@@ -31,6 +31,7 @@ log = { version = "0.4", features = [] }
 rand = { workspace = true }
 reqwest = { version = "0.11", features = ["json", "stream"] }
 serde = { version = "1.0", features = ["derive"] }
+serde_bytes = "0.11.3"
 serde_derive = "1.0"
 serde_json = "1.0"
 thiserror = "1.0"
diff --git a/exe-unit/components/gsb-http-proxy/src/message.rs b/exe-unit/components/gsb-http-proxy/src/message.rs
index 322d41558..c6c5276ee 100644
--- a/exe-unit/components/gsb-http-proxy/src/message.rs
+++ b/exe-unit/components/gsb-http-proxy/src/message.rs
@@ -13,6 +13,7 @@ use ya_service_bus::{RpcMessage, RpcStreamMessage};
 pub struct GsbHttpCallMessage {
     pub method: String,
     pub path: String,
+    #[serde(with = "serde_bytes")]
     pub body: Option<Vec<u8>>,
     pub headers: HashMap<String, Vec<String>>,
 }
@@ -28,6 +29,7 @@ impl RpcMessage for GsbHttpCallMessage {
 pub struct GsbHttpCallStreamingMessage {
     pub method: String,
     pub path: String,
+    #[serde(with = "serde_bytes")]
     pub body: Option<Vec<u8>>,
     pub headers: HashMap<String, Vec<String>>,
 }
diff --git a/exe-unit/components/gsb-http-proxy/src/response.rs b/exe-unit/components/gsb-http-proxy/src/response.rs
index 4debee6be..494f491cd 100644
--- a/exe-unit/components/gsb-http-proxy/src/response.rs
+++ b/exe-unit/components/gsb-http-proxy/src/response.rs
@@ -22,6 +22,7 @@ pub struct GsbHttpCallResponseHeader {
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Default)]
 pub struct GsbHttpCallResponseBody {
+    #[serde(with = "serde_bytes")]
     pub msg_bytes: Vec<u8>,
 }